Influence of Oxygen Content on the Superconductivity of Bi-Based Oxides Homologous to 2212 Phase

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Abstract
Thermal desorption of oxygen and its relevance to superconductivity were examined for a series of oxides Bi2Sr2-x Ca1+x Cu2O y (x=0, 0.25, 0.5, 0.8 and 1.0) isostructural to the 2212 phase. The total oxygen desorbed up to 600°C amounted to 2∼3×10-5 mol/g for each oxide. T c was constant at about 80 K for all the as-prepared oxides but T c decreased linearly with x from 97 K (x=0) to 67 K (x=1.0) for the oxygen-desorbed oxides. The total oxygen contents (y) were determined and correlated with T c, which increased for x=0 and 0.25, whereas it went through a maximum at about y=8.15 for x=0.8.